A nurse is preparing to administer lidocaine 50 mg IV bolus. Available is lidocaine 200 mg/mL. How many mL should the nurse administer (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["0.3"]
Calculating the Lidocaine Dose
Problem: Administer 50 mg of lidocaine IV bolus. The available concentration is 200 mg/mL.
Steps:
Set up a proportion:
We want to find the number of milliliters (mL) needed.
We know the desired dose (50 mg) and the concentration of the medication (200 mg/mL).
Proportion:
x mL / 50 mg = 1 mL / 200 mg
Cross-multiply:
200x = 50
Solve for x:
x = 50 / 200
x = 0.25
Answer: The nurse should administer 0.3 mL of lidocaine per dose(rounded to the nearest tenth).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["10"]
Explanation
Calculating the Diphenhydramine Dose
Problem: Administer 25 mg of diphenhydramine elixir. The available concentration is 12.5 mg/5 mL.
Steps:
Set up a proportion:
We want to find the number of milliliters (mL) needed.
We know the desired dose (25 mg) and the concentration of the medication (12.5 mg/5 mL).
Proportion:
x mL / 25 mg = 5 mL / 12.5 mg
Cross-multiply:
12.5x = 125
Solve for x:
x = 125 / 12.5
x = 10
Answer: The nurse should administer 10 mL of diphenhydramine elixir per dose.
Correct Answer is B
Explanation
A) Administer the medication using a 5/8-inch needle:
Ceftriaxone is typically administered using a longer needle to ensure proper injection into the muscle. A 5/8-inch needle is more suitable for subcutaneous injections rather than intramuscular (IM) injections.
B) Administer the medication using a Z-track technique:
The Z-track technique is appropriate for IM injections of medications like ceftriaxone, which can be irritating to tissues. This technique helps prevent the medication from leaking into the subcutaneous tissue and minimizes discomfort by creating a zigzag path in the muscle.
C) Administer the medication in the deltoid muscle:
Ceftriaxone is generally administered in larger muscle groups, such as the vastus lateralis or gluteus muscle, rather than the deltoid. The deltoid is more commonly used for vaccines or smaller volume injections.
D) Administer the medication at a 45° angle:
For IM injections, the needle should be inserted at a 90° angle to the skin. A 45° angle is more appropriate for subcutaneous injections.
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